This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A128485 #15 Nov 10 2024 05:20:50 %S A128485 1,1,1,2,3,5,8,39,235,1096,51909,2491235,348410728,6071656665789, %T A128485 15126791566796828495,1317584644380565684408069688, %U A128485 7999921680639175567165604204659004361387 %N A128485 a(1)=a(2)=a(3)=1; for n > 3, a(n) = lcm(a(n-1) + a(n-2), a(n-3)). %H A128485 Robert Israel, <a href="/A128485/b128485.txt">Table of n, a(n) for n = 1..25</a> %p A128485 a[1]:=1: a[2]:=1: a[3]:=1: for n from 4 to 18 do a[n]:=lcm(a[n-1]+a[n-2],a[n-3]) od: seq(a[n],n=1..18); # _Emeric Deutsch_, May 22 2007 %K A128485 nonn %O A128485 1,4 %A A128485 _Leroy Quet_, May 07 2007 %E A128485 More terms from _Emeric Deutsch_, May 22 2007